Roasting-furnace.



No. 800,588. PATENTED SEPT. 26, 1905.

' A. R. MEYER.

ROASTING FURNACE.

APPLICATION FILED 0OT.12, 1903.

3 SHEETS-SHEET 1.

23 l l I 13 22 21 20 v 24 ,1 14 X 19 I witness? M Mam PATENTED SEPT. 26, 1905.

A. R. MEYER.

ROASTING FURNACE.

APPLICATION FILED OCT. 12, 1903 3 SHEETS-SHEET 2.

. w H H w bw UNTTED STATES PATENT OEETCE.

AUGUST R. MEYER, OF KANSAS CITY, MISSOURI, ASSIGNOR TO THE UNITED ZINC AND CHEMICAL COMPANY, OF KANSAS CITY, MIS- SOURI, A CORPORATION OF NEW JERSEY.

ROASTING-FURNACE.

Specification of Letters Patent.

Patented Sept. 26, 1905.

Application filed October 12, 1903, Serial No. 176,777.

To (0Z7. whom it may concern.-

Be it known that 1, AUGUST R. MEYER, a citizen of the United States, residing at Kansas City, Jackson county, Missouri, have invented certain new and useful Improvements in Roasting-Furnaces, of which the following is a specification.

This invention relates to that class of roasting-furnaces which may be used for roasting any kind of ore or material in which rotating shafts are provided with rabbles that operate upon ore passing successively to hearths at different levels, while the heated gases travel upward as the ore travels downward; and the invention consists in constructing the structure so as to afford a plurality of hearths at each level cooperating with the rabbles of a plurality of shafts and in certain details of construction whereby to reduce the cost of erection and operation, as fully set forth hereinafter, and as illustrated in the accompanying drawings, in which Figure 1 is a vertical section of a roastingfurnace embodying my improvement; Fig. 2, a horizontal sectional view upon different levels; Fig. 3, a longitudinal vertical section.

The structure instead of being circular, as usual, is rectangular in cross-section, parallel side walls 2 2 being built of masonry in any suitable manner and constituting the abutments of a series of superposed arches l 1 l and being suitably strengthened or buttressed to resist the thrust of the arches, as by vertical beams 3 3, connected by cross-beams 4 above the arch 5, constituting the top or roof of the structure. The structure is of any desired length so as to form a plurality of hearths above each arch 1, the latter having openings for the passage of a plurality of vertical shafts 7, supporting radial rabbles 16, arranged to operate above the hearths, as usual, and being hollow and communicating with the hollow shafts. The material is automatically fed from hoppers 12 to the upper hearths and passes from the latter through chutes 9 to the hearths below and through central chutes 17 to the next lower hearths, and so on in succession to the bottom hearths, where the cinder is discharged through spouts 18, all in a manner too well known to require detailed description. It will be seen, however, that there is a plurality of hearths supported by each arch upon the same plane, each hearth cooperating with the rabbles of one of the shafts, and that thereby there is secured great economy of cost of construction, inasmuch as the rectangular structure can be more readily and economically built and strengthened, as the amount of masonry in proportion to each shaft is very much less than that required in connection with any structure where there is but a single shaft and a single hearth upon one plane, while the straight arches can be constructed much more economically than circular arches. construction is more economical in operation, as the fire-gases can be carried forward continuously from one end to the other over the entire series of hearths.

Where additional heat to that produced by the combustion of the sulfur in the ore is required, muffles may be arranged below the hearths, and this arrangement may be economically secured by a series of intermediate arches 6, each forming a chamber with the hearth-arch above extending the entire length of the structure, and the gases may be carried through the muffles in series by flues in the end walls of the structure, as indicated by 00. Each muffle may be heated by gas from a pipe 30 or otherwise.

To introduce air under pressure at thelower ends of the shafts while permitting the rotation of the latter, the air-inlet pipe 14: communicates with a casing 19, surrounding the lower end of each shaft and provided with an annular pocket 20, open at the top to receive the flange of a ring 21, secured to the shaft, and in this pocket is placed any suitable liquid which Will form a seal or water lute, so that the air cannot escape from the casing 19, but must pass through inlet-openings 22 into the interior of the shaft and thence, as usual, to the rabbles, and to regulate the back pressure and the quantity of air passing to the rabbles there is provided a sliding damper 23 at the upper end of each shaft.

The entire series of shafts may be driven from a single cross-shaft 24: through the medium of gearing 15, with means for clutching the gearing to the shaft 24, as required.

Without limiting myself to the precise construction and arrangement of parts shown, I claim A furnace having side and end Walls of masonry and external buttresses, at the opposite sides connected by cross-beams, with arches 1 The fit 800,588

extending from end to end and a plurality of In testimony whereofIhave signed my name hearths above each arch, other arches 6 arto this specificationin the presence of two subrangecl below the hearth-arches to form interscribing Witnesses.

mediate fines, said fiues connected in series, AUGUST R. MEYER. and a plurality of shafts and rabbles carried l l/Vitnesses: i

thereby to sweep over the different hearths, N. J. MCCARTY,

substantially as set forth. I E. B. SHAW. 

